Cold carcass weight, fat thickness, C measurement and longissimus dorsi depth for predicting the carcass composition of Rasa Aragonesa ewes with different body condition score

in

Purroy A. (ed.).

Etat corporel des brebis et chèvres Zaragoza : CIHEAM

Options Méditerranéennes : Série A. Séminaires Méditerranéens; n. 13 1992

pages 19-24

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--- D elfa R., Colomer-Rocher F., Teixeira A. Cold carcass weigh t, fat th ickn ess, C measu remen t an d lon gissimu s dorsi depth for predictin g th e carcass composition of R asa Aragon esa ewes with differen t body con dition score. In : Purroy A. (ed.). Etat corporel des brebis et chèvres. Zaragoza : CIHEAM, 1992. p. 19-24 (Options Méditerranéennes : Série A. Séminaires Méditerranéens; n. 13) ---

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Cold carcass weight, fat thickness,

C measurement and longissimus dorsi depth for predicting the carcass composition

of

body condition score

R. DELFA*

A. TEIXEIRA**

COLOMER-ROCHER"

*SERVICIO DE INVESTIGACION AGRARIA DIPUTACION GENERAL DE ARAGON APDO. 727 ZARAGOZA, (SPAIN)

**ESCOLA SUPERIOR AGRARIA DE BRAGANÇA APT. 172,5301 BRAGANÇA CODEX, (PORTUGAL)

- T5e precision of the use of cold carcass weight, f a t thickness, C measurement and longissinzus dorsi depth f o r predicting the carcass composition were determined in 52 adult aged 10 [s.d. 2) years and ranging in body condition score (BCS) front 1.5 to 4.5. The cold carcass weight the best predictor of intermuscular fat (1'=0.94) arzd the inclusion of the C mensurentent in multiple regression with the cold carcass weight estimates with accuracy the subcutaneous fat (13=0.91). The pelvic and kidney fat c m be predicted wifh f h e same precision by cold carcass weight in rnultiple regression with fat thickness or BCS (r"=0.86). 95% of the variation in total carcass fat was accounted for by variation in cold carcass weight and fat thickness. The best nluscle carcass predictors were cold carcass weight in multiple regression with fat thickness or C measurement (13=0.91).

- 52 adultes de vides et d'état 1,5 et 4,5, ont été utilisées

la composition de la à du poids de la état (EC), de du

sous-cutané au niveau (EGL), et m. longissimus dorsi. est le

de la 0,94) et en équation de multiple avec la et l'EC

ils sont les muscle et de la sous-cutanée de la 0,91) et

0,861. est en équation de multiple avec ils sont les du total 0,95) O,S6) et muscle total (P= 0,91) de la

Introduction

The fat thickness and depth muscle

have been used the composition

in by by

(1981).

ln (1939) used the and C

as to

classify At the same time (1939)

B ) was an of total

muscle C) was

highly

(1961) suggested that the

was of m. Longissimus

dorsi weight than total muscle and the J

was C to

estimate the total fat.

et al. (1982) showed that a visua1 assessment of fat and kidney knob and channel fat

of composition estimates and that the sample joints most this way et al. (1987) found that the inclusion of fat

as independent in with

the of

composition

(1965), (1979), Thompson

and Atkins (1980) and Wood and “Fie (1980).

useful to avoid the

difficult and of dissections.

the use of weights as independent of

will in of fat and

tissues 1977;

1980).

objective of

study was of the use of fat

thickness, Lolzgissinzus dorsi depth

the composition of

ewes with body condition of the

et al, 1989; et al. 1989).

and methods

52

flock of de

using

the to 5 of

0.25 units) The of each ewe

was assessed to the 0.25 by

The in the

of - 24

fasting. The at 6°C 24

was the

The and the left side

was dissected into muscle, bone, subcutaneous, pelvic

m. Longissimus dorsi depth and C

1939) on a joint

by et al.

(1989).

The between the

assessed on (fat thickness, C Longissimus dorsi depth) and analyzed using

1980).

The means and s.d.s of all

to condition showed in

Tables 1 and 2. substantial

The coefficients between fat depots and

cold weight, and

on given in Tables 3 , 4 , 5 and 6. The best fat in with weight, which

(1965), and Johnson (1979), Thompson and Atkins (1980) and Wood and

“Fie (1980) et al. (1986) and et al.

(1987).

weight is the best

of and pelvic plus

kidney fat can with the same by

cold weight and fat weight and

95% of the in total fat was

accounted by in cold weight and fat

thickness. et al. (1990) found that the same

in 79% of

the in total be

explained because 52 ewes

of condition the

These equations only can be ewes

will in

of of

of subcutaneous fat development (subjective

fat as of

total fat content depends on the constancy of fat

and if in of

subcutaneous fat to total fat and is applied

will be biased to some extent 1977)

coefficients between total muscle and cold weight,

assessed on given in Table 7. The best

muscle is the cold weight in

fat thickness C

The inclusion of weight as an independent in a

fat thickness and fat kidney weight in

estimate the lean content has also by (1963). The use of fat

like “C” fat thickness assessed on on live animal with

machine of lean content which

et al. (1963); Timon and (1966); et al. (1976) and Wood

and (1980). The smallest

coefficient between total muscle and m. longissimus dorsi depth has also been

by (1961) and Flamant and

(1966).

-20-

These results suggest that 90 % the in

total muscle weight was by in

cold weight fat thickness. So the

inclusion of cold weight as independent

in a multiple with fat

thickness the of muscle

weight which again with et al.

(,1990).

Conclusions

obtained, we could conclude:

- The cold weight is the best of

total fat in

- The inclusion of cold weight as an independent in a multiple with "C"

body

fat thickness, of muscle and

subcutaneous fat, kidney and pelvic fat, total fat and total muscle

Références

G.G.,

CLOETE, A. and VOSLOO, W.A. (1987). evaluation of

the lamb and mutton in of

South 2. The use of as of

S. Sci., 17(2):85-89.

A. and F. (1989). A note on the use of

body fat with

condition 49:327-329.

and

F. (1991). of fat

longissimus depth in with same

14: 37-42.

and W.Y. (1963).

composition. J. Anim. Sci., 22:218- 221.

J.C. and (1969). Estimation

de la qualité de la de

Zootech., (1):89-113.

(1939). in mutton

and beef with to the of muscle,

fat and bone. J. Vet. Sci., 12:379-463.

and An

evaluation of in beef

to

and T.G. (1963). of

lamb composition weghits and

J. Anim. Sci., 22:828.

32:999-1007.

A.J.,

and G. (1976). of lean content of

of types. J. Sci., Camb.,

86;23-34.

and A. (1977). A

of the of the main types of

25165-179.

A.J. (1980). Fat in

the of cattle, sheep and pigs: A Science, 583-98.

A.J., and

G. (1982). evaluation in livestock and

(1979).

and lamb fatness

39th Annual of N.Z. Society of 12pp.

(1984). of lamb

wall by by a total depth

Livestock Science, 11:185-194.

C.L. and (1986). of ewe mutton

weight,

of the New Zealand Society of 4659-61.

(1939). quality in the sheep with

to sample joints as

indices if Sci., 29.544-626.

J.S. and

lamb mutton Sci., Camb., 57:319-323.

STEEL, (1980).

of Statistics. 2nd ed. New A.,

F. (1989). fat depots and body

in 49:275-280.

and Use of

composition in lambs. Aust. J. Exp. Anim.

20:144-150.

and Quantitative

estimates of lamb composition. 3.

of efficiency of sample joint composition, specific

7;189-201.

(1980). The significance

of in of lamb

31:315-319.

Table 1. Composition of the corrected half carcass weights grouped according to body condition score (BCS) et al., 1989).

I _T ^T T

FAT (g) FATk)

(g) (S)

BONE (g) (g)

- s.d.

138 135 288 267 353 522

- s.d.

30 54 98 247 343 235 -

s.d.

517 505 542 987 737 973

-

1373"

1291A 153Y 15278 1595' 1571'

~

s.d.

149 190 213 176 187 207

-

79"

163b 666' 685' 1489d 2793'

- s.d.

48 82 234 243 667 993

-

300"

535b 862 96T 1386d 2183' 12,o"

13,l"

17,5b 19,3b 23,6' 30,9d 1,5 to 1,75

(n = 8) 2,O to 2,25 (n = 8) 2.5 to 2,75

(n = 8) 3,O to 3,25 (n = 8) 3 3 to 3,75 (n = 8) 4,O to 4,50 (n = 12)

3680"

3854"

4869b 5421b 5945"' 68288'

58"

137b 3 5 2 489' 839d ,314"

with the same significantly at < 0,05 at 0,Ol

Table 2. lumbar joint in ewes of different body condition score (BCS) et al., 1989).

T T

T

l-

Ï

T

^T;

-

220' 226b 342b 367b 459"' 575BC

~

s.d.

52,4 39,3 38,7 56,8 82,9 103,1 1,5 to 1,75

(n = 8) 2,O to 2,25 (n= 8) 2,5 to 2,75

(n = 8) 3,O to 3,25 (n = 8) 3,5 to 3,75 (n = 8) 4,O to 4,50 (n = 12)

-

164A 166"

2118 2368c 2 5 F 287D

~

s.d.

40,5 35,5 27,9 30,9 48,2 40,6 112"

106"

112A 110A 114"

112"

s.d.

6 8 4 3 6 5

60"ß 538 66A 68*

69"

66A s.d.

12 6 7 5 9 6

18"

17"

23' 30' 3OC 3 l C

s.d.

5 3 2 3 5 3

0,Y l,?

3 ,8b 3,6b 7 3 14,4d

42AB 368

56"c

49AC s.d.

12,5 5,0 14,7 12,9 26,5 19,5

3' 7"

4 3 b

44b 100' 186d

s.d.

2,3 4,7 14,2 17,3 45,4 54,1

14b 29Ac 25A' 40''

50d

with in the same significantly at < 0,05 case) and at < 0,Ol case).

A = width of muscle lorzgissi?ms domi; = depth of muscle m. lorzgissinms dorsi: C = fat thickness above

- 22-

Table 3. coefficients (rz) of between total fat and cold

weight, and

body condition

LFTh

0.95""

CCW

+

0.93""

CCW

0.86":'""

C

0.80""

CS

0 . 7 5 ~

**

on (LFTh)

C

Cold weight ("W)

Total fat = 301.18 CCW - 3296.57 (&0.93, 0.01; Sb= 11.64)

Total fat = 241.5 CCW

+

Table coefficients (r2) of

between total subcutaneous fat and cold

weight, on

and body condition

TOTAL

LFTh

0.91""

CCW -I- C

ojjg*:c CCW

+

037""

ccw

0.85""

C

0 . 7 2 ~ : CS

0.72""

** p< 0.01

fat on

C (C)

Cold weight ("W)

Total subcutaneous fat = 108.29 CCW 68.16 LFTh - 1444.2 0.01; sbl= 12.39; sb2= 21.24)

Total subcutaneous fat = 79.84 CCW -e 85.9 C - 1043.8 0.01; sbl= 14.68; sb2= 18.42)

Table 5. coefficients (r2) of

cold weight,

and body condition

TOTAL

LFTh

ccw

0.84W:

C

0.80""

0.72":::

0.94":':

0.01

on (LFTh)

C (C)

Cold weight ("W)

Total = 96.9 CCW - 831.1

0.0001; Sb= 3.6)

Table 6. coefficients (r*) of between kidney and pelvic fat and cold

weight, and

body condition

LFTh C

ccw

CCW -F LFTh CCW

+

*:*

on (LFTh)

C

("W) . ,

Total kidney and pelvic fat = 63.4 CCW - 687.2 0.0001; sb= 3.9)

Total kidney and pelvic fat = -t 40.4 CCW - 809.5 0.0001; sbl= 76.71; sb2= 9.75)

Table 7. (r') of correlations between total carcass muscle and cold carcass weight, measurements obtained on carcass and body condition score.

LFTh

0.91";":

CCW

+

0.91""

CCW

+

0.88"*

"W

0.62""

0.58""' C

0.76""

0.45q:"x'

*:* ^0.01

on

C

Cold weight (CCW)

Total muscle = 217.1 CCW

+

Total = 243.1 C.C.W. - 96.6 C

+

-24-